Annotation of /trunk/mkinitrd-magellan/busybox/networking/libiproute/iproute.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
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File size: 21602 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 21602 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * iproute.c "ip route". | ||
4 | * | ||
5 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
6 | * | ||
7 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | ||
8 | * | ||
9 | * | ||
10 | * Changes: | ||
11 | * | ||
12 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses | ||
13 | * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized | ||
14 | */ | ||
15 | |||
16 | niro | 816 | #include "ip_common.h" /* #include "libbb.h" is inside */ |
17 | niro | 532 | #include "rt_names.h" |
18 | #include "utils.h" | ||
19 | |||
20 | #ifndef RTAX_RTTVAR | ||
21 | #define RTAX_RTTVAR RTAX_HOPS | ||
22 | #endif | ||
23 | |||
24 | |||
25 | niro | 816 | typedef struct filter_t { |
26 | niro | 532 | int tb; |
27 | niro | 816 | smallint flushed; |
28 | niro | 532 | char *flushb; |
29 | int flushp; | ||
30 | int flushe; | ||
31 | struct rtnl_handle *rth; | ||
32 | int protocol, protocolmask; | ||
33 | int scope, scopemask; | ||
34 | int type, typemask; | ||
35 | int tos, tosmask; | ||
36 | int iif, iifmask; | ||
37 | int oif, oifmask; | ||
38 | int realm, realmmask; | ||
39 | inet_prefix rprefsrc; | ||
40 | inet_prefix rvia; | ||
41 | inet_prefix rdst; | ||
42 | inet_prefix mdst; | ||
43 | inet_prefix rsrc; | ||
44 | inet_prefix msrc; | ||
45 | niro | 816 | } filter_t; |
46 | niro | 532 | |
47 | niro | 816 | #define filter (*(filter_t*)&bb_common_bufsiz1) |
48 | |||
49 | niro | 532 | static int flush_update(void) |
50 | { | ||
51 | if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) { | ||
52 | niro | 816 | bb_perror_msg("failed to send flush request"); |
53 | niro | 532 | return -1; |
54 | } | ||
55 | filter.flushp = 0; | ||
56 | return 0; | ||
57 | } | ||
58 | |||
59 | static unsigned get_hz(void) | ||
60 | { | ||
61 | static unsigned hz_internal; | ||
62 | FILE *fp; | ||
63 | |||
64 | if (hz_internal) | ||
65 | return hz_internal; | ||
66 | |||
67 | niro | 816 | fp = fopen_for_read("/proc/net/psched"); |
68 | niro | 532 | if (fp) { |
69 | unsigned nom, denom; | ||
70 | |||
71 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) | ||
72 | if (nom == 1000000) | ||
73 | hz_internal = denom; | ||
74 | fclose(fp); | ||
75 | } | ||
76 | if (!hz_internal) | ||
77 | hz_internal = sysconf(_SC_CLK_TCK); | ||
78 | return hz_internal; | ||
79 | } | ||
80 | |||
81 | niro | 984 | static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM, |
82 | niro | 816 | struct nlmsghdr *n, void *arg UNUSED_PARAM) |
83 | niro | 532 | { |
84 | struct rtmsg *r = NLMSG_DATA(n); | ||
85 | int len = n->nlmsg_len; | ||
86 | struct rtattr * tb[RTA_MAX+1]; | ||
87 | char abuf[256]; | ||
88 | inet_prefix dst; | ||
89 | inet_prefix src; | ||
90 | int host_len = -1; | ||
91 | SPRINT_BUF(b1); | ||
92 | |||
93 | if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) { | ||
94 | fprintf(stderr, "Not a route: %08x %08x %08x\n", | ||
95 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); | ||
96 | return 0; | ||
97 | } | ||
98 | if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE) | ||
99 | return 0; | ||
100 | len -= NLMSG_LENGTH(sizeof(*r)); | ||
101 | niro | 816 | if (len < 0) |
102 | bb_error_msg_and_die("wrong nlmsg len %d", len); | ||
103 | niro | 532 | |
104 | if (r->rtm_family == AF_INET6) | ||
105 | host_len = 128; | ||
106 | else if (r->rtm_family == AF_INET) | ||
107 | host_len = 32; | ||
108 | |||
109 | if (r->rtm_family == AF_INET6) { | ||
110 | if (filter.tb) { | ||
111 | if (filter.tb < 0) { | ||
112 | niro | 816 | if (!(r->rtm_flags & RTM_F_CLONED)) { |
113 | niro | 532 | return 0; |
114 | } | ||
115 | } else { | ||
116 | niro | 816 | if (r->rtm_flags & RTM_F_CLONED) { |
117 | niro | 532 | return 0; |
118 | } | ||
119 | if (filter.tb == RT_TABLE_LOCAL) { | ||
120 | if (r->rtm_type != RTN_LOCAL) { | ||
121 | return 0; | ||
122 | } | ||
123 | } else if (filter.tb == RT_TABLE_MAIN) { | ||
124 | if (r->rtm_type == RTN_LOCAL) { | ||
125 | return 0; | ||
126 | } | ||
127 | } else { | ||
128 | return 0; | ||
129 | } | ||
130 | } | ||
131 | } | ||
132 | } else { | ||
133 | if (filter.tb > 0 && filter.tb != r->rtm_table) { | ||
134 | return 0; | ||
135 | } | ||
136 | } | ||
137 | if (filter.rdst.family && | ||
138 | (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) { | ||
139 | return 0; | ||
140 | } | ||
141 | if (filter.mdst.family && | ||
142 | (r->rtm_family != filter.mdst.family || | ||
143 | (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) { | ||
144 | return 0; | ||
145 | } | ||
146 | if (filter.rsrc.family && | ||
147 | (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) { | ||
148 | return 0; | ||
149 | } | ||
150 | if (filter.msrc.family && | ||
151 | (r->rtm_family != filter.msrc.family || | ||
152 | (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) { | ||
153 | return 0; | ||
154 | } | ||
155 | |||
156 | memset(tb, 0, sizeof(tb)); | ||
157 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); | ||
158 | |||
159 | if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen)) | ||
160 | return 0; | ||
161 | if (filter.mdst.family && filter.mdst.bitlen >= 0 && | ||
162 | inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len)) | ||
163 | return 0; | ||
164 | |||
165 | if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen)) | ||
166 | return 0; | ||
167 | if (filter.msrc.family && filter.msrc.bitlen >= 0 && | ||
168 | inet_addr_match(&src, &filter.msrc, r->rtm_src_len)) | ||
169 | return 0; | ||
170 | |||
171 | if (filter.flushb && | ||
172 | r->rtm_family == AF_INET6 && | ||
173 | r->rtm_dst_len == 0 && | ||
174 | r->rtm_type == RTN_UNREACHABLE && | ||
175 | tb[RTA_PRIORITY] && | ||
176 | *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1) | ||
177 | return 0; | ||
178 | |||
179 | if (filter.flushb) { | ||
180 | struct nlmsghdr *fn; | ||
181 | if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) { | ||
182 | if (flush_update()) | ||
183 | niro | 816 | bb_error_msg_and_die("flush"); |
184 | niro | 532 | } |
185 | fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp)); | ||
186 | memcpy(fn, n, n->nlmsg_len); | ||
187 | fn->nlmsg_type = RTM_DELROUTE; | ||
188 | fn->nlmsg_flags = NLM_F_REQUEST; | ||
189 | fn->nlmsg_seq = ++filter.rth->seq; | ||
190 | filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; | ||
191 | niro | 816 | filter.flushed = 1; |
192 | niro | 532 | return 0; |
193 | } | ||
194 | |||
195 | if (n->nlmsg_type == RTM_DELROUTE) { | ||
196 | niro | 816 | printf("Deleted "); |
197 | niro | 532 | } |
198 | if (r->rtm_type != RTN_UNICAST && !filter.type) { | ||
199 | niro | 984 | printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1)); |
200 | niro | 532 | } |
201 | |||
202 | if (tb[RTA_DST]) { | ||
203 | if (r->rtm_dst_len != host_len) { | ||
204 | niro | 816 | printf("%s/%u ", rt_addr_n2a(r->rtm_family, |
205 | RTA_DATA(tb[RTA_DST]), | ||
206 | abuf, sizeof(abuf)), | ||
207 | r->rtm_dst_len | ||
208 | ); | ||
209 | niro | 532 | } else { |
210 | niro | 816 | printf("%s ", format_host(r->rtm_family, |
211 | RTA_PAYLOAD(tb[RTA_DST]), | ||
212 | RTA_DATA(tb[RTA_DST]), | ||
213 | abuf, sizeof(abuf)) | ||
214 | ); | ||
215 | niro | 532 | } |
216 | } else if (r->rtm_dst_len) { | ||
217 | niro | 816 | printf("0/%d ", r->rtm_dst_len); |
218 | niro | 532 | } else { |
219 | niro | 816 | printf("default "); |
220 | niro | 532 | } |
221 | if (tb[RTA_SRC]) { | ||
222 | if (r->rtm_src_len != host_len) { | ||
223 | niro | 816 | printf("from %s/%u ", rt_addr_n2a(r->rtm_family, |
224 | RTA_DATA(tb[RTA_SRC]), | ||
225 | abuf, sizeof(abuf)), | ||
226 | r->rtm_src_len | ||
227 | ); | ||
228 | niro | 532 | } else { |
229 | niro | 816 | printf("from %s ", format_host(r->rtm_family, |
230 | RTA_PAYLOAD(tb[RTA_SRC]), | ||
231 | RTA_DATA(tb[RTA_SRC]), | ||
232 | abuf, sizeof(abuf)) | ||
233 | ); | ||
234 | niro | 532 | } |
235 | } else if (r->rtm_src_len) { | ||
236 | niro | 816 | printf("from 0/%u ", r->rtm_src_len); |
237 | niro | 532 | } |
238 | if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) { | ||
239 | niro | 816 | printf("via %s ", format_host(r->rtm_family, |
240 | RTA_PAYLOAD(tb[RTA_GATEWAY]), | ||
241 | RTA_DATA(tb[RTA_GATEWAY]), | ||
242 | abuf, sizeof(abuf))); | ||
243 | niro | 532 | } |
244 | if (tb[RTA_OIF] && filter.oifmask != -1) { | ||
245 | niro | 816 | printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF]))); |
246 | niro | 532 | } |
247 | |||
248 | if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) { | ||
249 | /* Do not use format_host(). It is our local addr | ||
250 | and symbolic name will not be useful. | ||
251 | */ | ||
252 | niro | 816 | printf(" src %s ", rt_addr_n2a(r->rtm_family, |
253 | RTA_DATA(tb[RTA_PREFSRC]), | ||
254 | abuf, sizeof(abuf))); | ||
255 | niro | 532 | } |
256 | if (tb[RTA_PRIORITY]) { | ||
257 | niro | 816 | printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY])); |
258 | niro | 532 | } |
259 | if (r->rtm_family == AF_INET6) { | ||
260 | struct rta_cacheinfo *ci = NULL; | ||
261 | if (tb[RTA_CACHEINFO]) { | ||
262 | ci = RTA_DATA(tb[RTA_CACHEINFO]); | ||
263 | } | ||
264 | if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) { | ||
265 | if (r->rtm_flags & RTM_F_CLONED) { | ||
266 | niro | 816 | printf("%c cache ", _SL_); |
267 | niro | 532 | } |
268 | if (ci->rta_expires) { | ||
269 | niro | 816 | printf(" expires %dsec", ci->rta_expires / get_hz()); |
270 | niro | 532 | } |
271 | if (ci->rta_error != 0) { | ||
272 | niro | 816 | printf(" error %d", ci->rta_error); |
273 | niro | 532 | } |
274 | } else if (ci) { | ||
275 | if (ci->rta_error != 0) | ||
276 | niro | 816 | printf(" error %d", ci->rta_error); |
277 | niro | 532 | } |
278 | } | ||
279 | if (tb[RTA_IIF] && filter.iifmask != -1) { | ||
280 | niro | 816 | printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF]))); |
281 | niro | 532 | } |
282 | niro | 816 | bb_putchar('\n'); |
283 | niro | 532 | return 0; |
284 | } | ||
285 | |||
286 | niro | 816 | /* Return value becomes exitcode. It's okay to not return at all */ |
287 | static int iproute_modify(int cmd, unsigned flags, char **argv) | ||
288 | niro | 532 | { |
289 | niro | 816 | static const char keywords[] ALIGN1 = |
290 | niro | 984 | "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0") |
291 | niro | 816 | "dev\0""oif\0""to\0""metric\0"; |
292 | enum { | ||
293 | ARG_src, | ||
294 | ARG_via, | ||
295 | ARG_mtu, PARM_lock, | ||
296 | ARG_protocol, | ||
297 | niro | 984 | IF_FEATURE_IP_RULE(ARG_table,) |
298 | niro | 816 | ARG_dev, |
299 | ARG_oif, | ||
300 | ARG_to, | ||
301 | ARG_metric, | ||
302 | }; | ||
303 | enum { | ||
304 | gw_ok = 1 << 0, | ||
305 | dst_ok = 1 << 1, | ||
306 | proto_ok = 1 << 2, | ||
307 | type_ok = 1 << 3 | ||
308 | }; | ||
309 | niro | 532 | struct rtnl_handle rth; |
310 | struct { | ||
311 | struct nlmsghdr n; | ||
312 | struct rtmsg r; | ||
313 | char buf[1024]; | ||
314 | } req; | ||
315 | niro | 816 | char mxbuf[256]; |
316 | niro | 532 | struct rtattr * mxrta = (void*)mxbuf; |
317 | unsigned mxlock = 0; | ||
318 | niro | 816 | char *d = NULL; |
319 | smalluint ok = 0; | ||
320 | int arg; | ||
321 | niro | 532 | |
322 | memset(&req, 0, sizeof(req)); | ||
323 | |||
324 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); | ||
325 | niro | 816 | req.n.nlmsg_flags = NLM_F_REQUEST | flags; |
326 | niro | 532 | req.n.nlmsg_type = cmd; |
327 | req.r.rtm_family = preferred_family; | ||
328 | niro | 816 | if (RT_TABLE_MAIN) /* if it is zero, memset already did it */ |
329 | req.r.rtm_table = RT_TABLE_MAIN; | ||
330 | if (RT_SCOPE_NOWHERE) | ||
331 | req.r.rtm_scope = RT_SCOPE_NOWHERE; | ||
332 | niro | 532 | |
333 | if (cmd != RTM_DELROUTE) { | ||
334 | req.r.rtm_protocol = RTPROT_BOOT; | ||
335 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | ||
336 | req.r.rtm_type = RTN_UNICAST; | ||
337 | } | ||
338 | |||
339 | mxrta->rta_type = RTA_METRICS; | ||
340 | mxrta->rta_len = RTA_LENGTH(0); | ||
341 | |||
342 | niro | 816 | while (*argv) { |
343 | arg = index_in_substrings(keywords, *argv); | ||
344 | if (arg == ARG_src) { | ||
345 | niro | 532 | inet_prefix addr; |
346 | NEXT_ARG(); | ||
347 | get_addr(&addr, *argv, req.r.rtm_family); | ||
348 | niro | 816 | if (req.r.rtm_family == AF_UNSPEC) |
349 | niro | 532 | req.r.rtm_family = addr.family; |
350 | addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen); | ||
351 | niro | 816 | } else if (arg == ARG_via) { |
352 | niro | 532 | inet_prefix addr; |
353 | niro | 816 | ok |= gw_ok; |
354 | niro | 532 | NEXT_ARG(); |
355 | get_addr(&addr, *argv, req.r.rtm_family); | ||
356 | if (req.r.rtm_family == AF_UNSPEC) { | ||
357 | req.r.rtm_family = addr.family; | ||
358 | } | ||
359 | addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen); | ||
360 | niro | 816 | } else if (arg == ARG_mtu) { |
361 | niro | 532 | unsigned mtu; |
362 | NEXT_ARG(); | ||
363 | niro | 816 | if (index_in_strings(keywords, *argv) == PARM_lock) { |
364 | mxlock |= (1 << RTAX_MTU); | ||
365 | niro | 532 | NEXT_ARG(); |
366 | } | ||
367 | niro | 984 | mtu = get_unsigned(*argv, "mtu"); |
368 | niro | 532 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu); |
369 | niro | 816 | } else if (arg == ARG_protocol) { |
370 | niro | 532 | uint32_t prot; |
371 | NEXT_ARG(); | ||
372 | if (rtnl_rtprot_a2n(&prot, *argv)) | ||
373 | invarg(*argv, "protocol"); | ||
374 | req.r.rtm_protocol = prot; | ||
375 | niro | 816 | ok |= proto_ok; |
376 | niro | 532 | #if ENABLE_FEATURE_IP_RULE |
377 | niro | 816 | } else if (arg == ARG_table) { |
378 | niro | 532 | uint32_t tid; |
379 | NEXT_ARG(); | ||
380 | if (rtnl_rttable_a2n(&tid, *argv)) | ||
381 | invarg(*argv, "table"); | ||
382 | req.r.rtm_table = tid; | ||
383 | #endif | ||
384 | niro | 816 | } else if (arg == ARG_dev || arg == ARG_oif) { |
385 | niro | 532 | NEXT_ARG(); |
386 | d = *argv; | ||
387 | niro | 816 | } else if (arg == ARG_metric) { |
388 | uint32_t metric; | ||
389 | NEXT_ARG(); | ||
390 | niro | 984 | metric = get_u32(*argv, "metric"); |
391 | niro | 816 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric); |
392 | niro | 532 | } else { |
393 | int type; | ||
394 | inet_prefix dst; | ||
395 | |||
396 | niro | 816 | if (arg == ARG_to) { |
397 | niro | 532 | NEXT_ARG(); |
398 | } | ||
399 | niro | 816 | if ((**argv < '0' || **argv > '9') |
400 | && rtnl_rtntype_a2n(&type, *argv) == 0) { | ||
401 | niro | 532 | NEXT_ARG(); |
402 | req.r.rtm_type = type; | ||
403 | niro | 816 | ok |= type_ok; |
404 | niro | 532 | } |
405 | |||
406 | niro | 816 | if (ok & dst_ok) { |
407 | niro | 532 | duparg2("to", *argv); |
408 | } | ||
409 | get_prefix(&dst, *argv, req.r.rtm_family); | ||
410 | if (req.r.rtm_family == AF_UNSPEC) { | ||
411 | req.r.rtm_family = dst.family; | ||
412 | } | ||
413 | req.r.rtm_dst_len = dst.bitlen; | ||
414 | niro | 816 | ok |= dst_ok; |
415 | niro | 532 | if (dst.bytelen) { |
416 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); | ||
417 | } | ||
418 | } | ||
419 | niro | 816 | argv++; |
420 | niro | 532 | } |
421 | |||
422 | niro | 816 | xrtnl_open(&rth); |
423 | niro | 532 | |
424 | if (d) { | ||
425 | int idx; | ||
426 | |||
427 | ll_init_map(&rth); | ||
428 | |||
429 | if (d) { | ||
430 | niro | 816 | idx = xll_name_to_index(d); |
431 | niro | 532 | addattr32(&req.n, sizeof(req), RTA_OIF, idx); |
432 | } | ||
433 | } | ||
434 | |||
435 | if (mxrta->rta_len > RTA_LENGTH(0)) { | ||
436 | if (mxlock) { | ||
437 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock); | ||
438 | } | ||
439 | addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta)); | ||
440 | } | ||
441 | |||
442 | niro | 816 | if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT) |
443 | req.r.rtm_scope = RT_SCOPE_HOST; | ||
444 | else if (req.r.rtm_type == RTN_BROADCAST || | ||
445 | req.r.rtm_type == RTN_MULTICAST || | ||
446 | req.r.rtm_type == RTN_ANYCAST) | ||
447 | req.r.rtm_scope = RT_SCOPE_LINK; | ||
448 | else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) { | ||
449 | if (cmd == RTM_DELROUTE) | ||
450 | req.r.rtm_scope = RT_SCOPE_NOWHERE; | ||
451 | else if (!(ok & gw_ok)) | ||
452 | req.r.rtm_scope = RT_SCOPE_LINK; | ||
453 | } | ||
454 | |||
455 | niro | 532 | if (req.r.rtm_family == AF_UNSPEC) { |
456 | req.r.rtm_family = AF_INET; | ||
457 | } | ||
458 | |||
459 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) { | ||
460 | niro | 816 | return 2; |
461 | niro | 532 | } |
462 | |||
463 | return 0; | ||
464 | } | ||
465 | |||
466 | static int rtnl_rtcache_request(struct rtnl_handle *rth, int family) | ||
467 | { | ||
468 | struct { | ||
469 | struct nlmsghdr nlh; | ||
470 | struct rtmsg rtm; | ||
471 | } req; | ||
472 | struct sockaddr_nl nladdr; | ||
473 | |||
474 | memset(&nladdr, 0, sizeof(nladdr)); | ||
475 | memset(&req, 0, sizeof(req)); | ||
476 | nladdr.nl_family = AF_NETLINK; | ||
477 | |||
478 | req.nlh.nlmsg_len = sizeof(req); | ||
479 | niro | 816 | if (RTM_GETROUTE) |
480 | req.nlh.nlmsg_type = RTM_GETROUTE; | ||
481 | if (NLM_F_ROOT | NLM_F_REQUEST) | ||
482 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST; | ||
483 | /*req.nlh.nlmsg_pid = 0; - memset did it already */ | ||
484 | niro | 532 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; |
485 | req.rtm.rtm_family = family; | ||
486 | niro | 816 | if (RTM_F_CLONED) |
487 | req.rtm.rtm_flags = RTM_F_CLONED; | ||
488 | niro | 532 | |
489 | niro | 816 | return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr)); |
490 | niro | 532 | } |
491 | |||
492 | niro | 816 | static void iproute_flush_cache(void) |
493 | niro | 532 | { |
494 | niro | 816 | static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush"; |
495 | int flush_fd = open_or_warn(fn, O_WRONLY); | ||
496 | niro | 532 | |
497 | if (flush_fd < 0) { | ||
498 | niro | 816 | return; |
499 | niro | 532 | } |
500 | |||
501 | niro | 816 | if (write(flush_fd, "-1", 2) < 2) { |
502 | niro | 984 | bb_perror_msg("can't flush routing cache"); |
503 | niro | 816 | return; |
504 | niro | 532 | } |
505 | close(flush_fd); | ||
506 | } | ||
507 | |||
508 | static void iproute_reset_filter(void) | ||
509 | { | ||
510 | memset(&filter, 0, sizeof(filter)); | ||
511 | filter.mdst.bitlen = -1; | ||
512 | filter.msrc.bitlen = -1; | ||
513 | } | ||
514 | |||
515 | niro | 816 | /* Return value becomes exitcode. It's okay to not return at all */ |
516 | static int iproute_list_or_flush(char **argv, int flush) | ||
517 | niro | 532 | { |
518 | int do_ipv6 = preferred_family; | ||
519 | struct rtnl_handle rth; | ||
520 | char *id = NULL; | ||
521 | char *od = NULL; | ||
522 | niro | 816 | static const char keywords[] ALIGN1 = |
523 | /* "ip route list/flush" parameters: */ | ||
524 | "protocol\0" "dev\0" "oif\0" "iif\0" | ||
525 | "via\0" "table\0" "cache\0" | ||
526 | "from\0" "to\0" | ||
527 | /* and possible further keywords */ | ||
528 | "all\0" | ||
529 | "root\0" | ||
530 | "match\0" | ||
531 | "exact\0" | ||
532 | "main\0" | ||
533 | ; | ||
534 | enum { | ||
535 | KW_proto, KW_dev, KW_oif, KW_iif, | ||
536 | KW_via, KW_table, KW_cache, | ||
537 | KW_from, KW_to, | ||
538 | /* */ | ||
539 | KW_all, | ||
540 | KW_root, | ||
541 | KW_match, | ||
542 | KW_exact, | ||
543 | KW_main, | ||
544 | }; | ||
545 | int arg, parm; | ||
546 | niro | 532 | |
547 | iproute_reset_filter(); | ||
548 | filter.tb = RT_TABLE_MAIN; | ||
549 | |||
550 | niro | 816 | if (flush && !*argv) |
551 | bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\""); | ||
552 | niro | 532 | |
553 | niro | 816 | while (*argv) { |
554 | arg = index_in_substrings(keywords, *argv); | ||
555 | if (arg == KW_proto) { | ||
556 | niro | 532 | uint32_t prot = 0; |
557 | NEXT_ARG(); | ||
558 | filter.protocolmask = -1; | ||
559 | if (rtnl_rtprot_a2n(&prot, *argv)) { | ||
560 | niro | 816 | if (index_in_strings(keywords, *argv) != KW_all) |
561 | niro | 532 | invarg(*argv, "protocol"); |
562 | prot = 0; | ||
563 | filter.protocolmask = 0; | ||
564 | } | ||
565 | filter.protocol = prot; | ||
566 | niro | 816 | } else if (arg == KW_dev || arg == KW_oif) { |
567 | niro | 532 | NEXT_ARG(); |
568 | od = *argv; | ||
569 | niro | 816 | } else if (arg == KW_iif) { |
570 | niro | 532 | NEXT_ARG(); |
571 | id = *argv; | ||
572 | niro | 816 | } else if (arg == KW_via) { |
573 | niro | 532 | NEXT_ARG(); |
574 | niro | 816 | get_prefix(&filter.rvia, *argv, do_ipv6); |
575 | } else if (arg == KW_table) { /* table all/cache/main */ | ||
576 | NEXT_ARG(); | ||
577 | parm = index_in_substrings(keywords, *argv); | ||
578 | if (parm == KW_cache) | ||
579 | filter.tb = -1; | ||
580 | else if (parm == KW_all) | ||
581 | filter.tb = 0; | ||
582 | else if (parm != KW_main) { | ||
583 | #if ENABLE_FEATURE_IP_RULE | ||
584 | uint32_t tid; | ||
585 | if (rtnl_rttable_a2n(&tid, *argv)) | ||
586 | invarg(*argv, "table"); | ||
587 | filter.tb = tid; | ||
588 | #else | ||
589 | invarg(*argv, "table"); | ||
590 | #endif | ||
591 | } | ||
592 | } else if (arg == KW_cache) { | ||
593 | /* The command 'ip route flush cache' is used by OpenSWAN. | ||
594 | * Assuming it's a synonym for 'ip route flush table cache' */ | ||
595 | filter.tb = -1; | ||
596 | } else if (arg == KW_from) { | ||
597 | NEXT_ARG(); | ||
598 | parm = index_in_substrings(keywords, *argv); | ||
599 | if (parm == KW_root) { | ||
600 | niro | 532 | NEXT_ARG(); |
601 | get_prefix(&filter.rsrc, *argv, do_ipv6); | ||
602 | niro | 816 | } else if (parm == KW_match) { |
603 | niro | 532 | NEXT_ARG(); |
604 | get_prefix(&filter.msrc, *argv, do_ipv6); | ||
605 | } else { | ||
606 | niro | 816 | if (parm == KW_exact) |
607 | niro | 532 | NEXT_ARG(); |
608 | get_prefix(&filter.msrc, *argv, do_ipv6); | ||
609 | filter.rsrc = filter.msrc; | ||
610 | } | ||
611 | niro | 816 | } else { /* "to" is the default parameter */ |
612 | if (arg == KW_to) { | ||
613 | niro | 532 | NEXT_ARG(); |
614 | niro | 816 | arg = index_in_substrings(keywords, *argv); |
615 | niro | 532 | } |
616 | niro | 816 | /* parm = arg; - would be more plausible, but we reuse 'arg' here */ |
617 | if (arg == KW_root) { | ||
618 | niro | 532 | NEXT_ARG(); |
619 | get_prefix(&filter.rdst, *argv, do_ipv6); | ||
620 | niro | 816 | } else if (arg == KW_match) { |
621 | niro | 532 | NEXT_ARG(); |
622 | get_prefix(&filter.mdst, *argv, do_ipv6); | ||
623 | niro | 816 | } else { /* "to exact" is the default */ |
624 | if (arg == KW_exact) | ||
625 | niro | 532 | NEXT_ARG(); |
626 | get_prefix(&filter.mdst, *argv, do_ipv6); | ||
627 | filter.rdst = filter.mdst; | ||
628 | } | ||
629 | } | ||
630 | niro | 816 | argv++; |
631 | niro | 532 | } |
632 | |||
633 | if (do_ipv6 == AF_UNSPEC && filter.tb) { | ||
634 | do_ipv6 = AF_INET; | ||
635 | } | ||
636 | |||
637 | niro | 816 | xrtnl_open(&rth); |
638 | niro | 532 | ll_init_map(&rth); |
639 | |||
640 | if (id || od) { | ||
641 | int idx; | ||
642 | |||
643 | if (id) { | ||
644 | niro | 816 | idx = xll_name_to_index(id); |
645 | niro | 532 | filter.iif = idx; |
646 | filter.iifmask = -1; | ||
647 | } | ||
648 | if (od) { | ||
649 | niro | 816 | idx = xll_name_to_index(od); |
650 | niro | 532 | filter.oif = idx; |
651 | filter.oifmask = -1; | ||
652 | } | ||
653 | } | ||
654 | |||
655 | if (flush) { | ||
656 | char flushb[4096-512]; | ||
657 | |||
658 | niro | 816 | if (filter.tb == -1) { /* "flush table cache" */ |
659 | niro | 532 | if (do_ipv6 != AF_INET6) |
660 | iproute_flush_cache(); | ||
661 | if (do_ipv6 == AF_INET) | ||
662 | return 0; | ||
663 | } | ||
664 | |||
665 | filter.flushb = flushb; | ||
666 | filter.flushp = 0; | ||
667 | filter.flushe = sizeof(flushb); | ||
668 | filter.rth = &rth; | ||
669 | |||
670 | for (;;) { | ||
671 | niro | 816 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); |
672 | niro | 532 | filter.flushed = 0; |
673 | niro | 816 | xrtnl_dump_filter(&rth, print_route, NULL); |
674 | if (filter.flushed == 0) | ||
675 | niro | 532 | return 0; |
676 | niro | 816 | if (flush_update()) |
677 | return 1; | ||
678 | niro | 532 | } |
679 | } | ||
680 | |||
681 | if (filter.tb != -1) { | ||
682 | niro | 816 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); |
683 | } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) { | ||
684 | niro | 984 | bb_perror_msg_and_die("can't send dump request"); |
685 | niro | 532 | } |
686 | niro | 816 | xrtnl_dump_filter(&rth, print_route, NULL); |
687 | niro | 532 | |
688 | niro | 816 | return 0; |
689 | niro | 532 | } |
690 | |||
691 | |||
692 | niro | 816 | /* Return value becomes exitcode. It's okay to not return at all */ |
693 | static int iproute_get(char **argv) | ||
694 | niro | 532 | { |
695 | struct rtnl_handle rth; | ||
696 | struct { | ||
697 | niro | 816 | struct nlmsghdr n; |
698 | struct rtmsg r; | ||
699 | char buf[1024]; | ||
700 | niro | 532 | } req; |
701 | niro | 816 | char *idev = NULL; |
702 | char *odev = NULL; | ||
703 | bool connected = 0; | ||
704 | bool from_ok = 0; | ||
705 | static const char options[] ALIGN1 = | ||
706 | "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0"; | ||
707 | niro | 532 | |
708 | memset(&req, 0, sizeof(req)); | ||
709 | |||
710 | iproute_reset_filter(); | ||
711 | |||
712 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); | ||
713 | niro | 816 | if (NLM_F_REQUEST) |
714 | req.n.nlmsg_flags = NLM_F_REQUEST; | ||
715 | if (RTM_GETROUTE) | ||
716 | req.n.nlmsg_type = RTM_GETROUTE; | ||
717 | niro | 532 | req.r.rtm_family = preferred_family; |
718 | niro | 816 | /*req.r.rtm_table = 0; - memset did this already */ |
719 | /*req.r.rtm_protocol = 0;*/ | ||
720 | /*req.r.rtm_scope = 0;*/ | ||
721 | /*req.r.rtm_type = 0;*/ | ||
722 | /*req.r.rtm_src_len = 0;*/ | ||
723 | /*req.r.rtm_dst_len = 0;*/ | ||
724 | /*req.r.rtm_tos = 0;*/ | ||
725 | niro | 532 | |
726 | niro | 816 | while (*argv) { |
727 | switch (index_in_strings(options, *argv)) { | ||
728 | niro | 532 | case 0: /* from */ |
729 | { | ||
730 | inet_prefix addr; | ||
731 | NEXT_ARG(); | ||
732 | from_ok = 1; | ||
733 | get_prefix(&addr, *argv, req.r.rtm_family); | ||
734 | if (req.r.rtm_family == AF_UNSPEC) { | ||
735 | req.r.rtm_family = addr.family; | ||
736 | } | ||
737 | if (addr.bytelen) { | ||
738 | addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen); | ||
739 | } | ||
740 | req.r.rtm_src_len = addr.bitlen; | ||
741 | break; | ||
742 | } | ||
743 | case 1: /* iif */ | ||
744 | NEXT_ARG(); | ||
745 | idev = *argv; | ||
746 | break; | ||
747 | case 2: /* oif */ | ||
748 | case 3: /* dev */ | ||
749 | NEXT_ARG(); | ||
750 | odev = *argv; | ||
751 | break; | ||
752 | case 4: /* notify */ | ||
753 | req.r.rtm_flags |= RTM_F_NOTIFY; | ||
754 | break; | ||
755 | case 5: /* connected */ | ||
756 | connected = 1; | ||
757 | break; | ||
758 | case 6: /* to */ | ||
759 | NEXT_ARG(); | ||
760 | default: | ||
761 | { | ||
762 | inet_prefix addr; | ||
763 | get_prefix(&addr, *argv, req.r.rtm_family); | ||
764 | if (req.r.rtm_family == AF_UNSPEC) { | ||
765 | req.r.rtm_family = addr.family; | ||
766 | } | ||
767 | if (addr.bytelen) { | ||
768 | addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen); | ||
769 | } | ||
770 | req.r.rtm_dst_len = addr.bitlen; | ||
771 | } | ||
772 | niro | 816 | argv++; |
773 | niro | 532 | } |
774 | } | ||
775 | |||
776 | if (req.r.rtm_dst_len == 0) { | ||
777 | bb_error_msg_and_die("need at least destination address"); | ||
778 | } | ||
779 | |||
780 | niro | 816 | xrtnl_open(&rth); |
781 | niro | 532 | |
782 | ll_init_map(&rth); | ||
783 | |||
784 | if (idev || odev) { | ||
785 | int idx; | ||
786 | |||
787 | if (idev) { | ||
788 | niro | 816 | idx = xll_name_to_index(idev); |
789 | niro | 532 | addattr32(&req.n, sizeof(req), RTA_IIF, idx); |
790 | } | ||
791 | if (odev) { | ||
792 | niro | 816 | idx = xll_name_to_index(odev); |
793 | niro | 532 | addattr32(&req.n, sizeof(req), RTA_OIF, idx); |
794 | } | ||
795 | } | ||
796 | |||
797 | if (req.r.rtm_family == AF_UNSPEC) { | ||
798 | req.r.rtm_family = AF_INET; | ||
799 | } | ||
800 | |||
801 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { | ||
802 | niro | 816 | return 2; |
803 | niro | 532 | } |
804 | |||
805 | if (connected && !from_ok) { | ||
806 | struct rtmsg *r = NLMSG_DATA(&req.n); | ||
807 | int len = req.n.nlmsg_len; | ||
808 | struct rtattr * tb[RTA_MAX+1]; | ||
809 | |||
810 | niro | 816 | print_route(NULL, &req.n, NULL); |
811 | niro | 532 | |
812 | if (req.n.nlmsg_type != RTM_NEWROUTE) { | ||
813 | niro | 816 | bb_error_msg_and_die("not a route?"); |
814 | niro | 532 | } |
815 | len -= NLMSG_LENGTH(sizeof(*r)); | ||
816 | if (len < 0) { | ||
817 | niro | 816 | bb_error_msg_and_die("wrong len %d", len); |
818 | niro | 532 | } |
819 | |||
820 | memset(tb, 0, sizeof(tb)); | ||
821 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); | ||
822 | |||
823 | if (tb[RTA_PREFSRC]) { | ||
824 | tb[RTA_PREFSRC]->rta_type = RTA_SRC; | ||
825 | r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]); | ||
826 | } else if (!tb[RTA_SRC]) { | ||
827 | niro | 816 | bb_error_msg_and_die("failed to connect the route"); |
828 | niro | 532 | } |
829 | if (!odev && tb[RTA_OIF]) { | ||
830 | tb[RTA_OIF]->rta_type = 0; | ||
831 | } | ||
832 | if (tb[RTA_GATEWAY]) { | ||
833 | tb[RTA_GATEWAY]->rta_type = 0; | ||
834 | } | ||
835 | if (!idev && tb[RTA_IIF]) { | ||
836 | tb[RTA_IIF]->rta_type = 0; | ||
837 | } | ||
838 | req.n.nlmsg_flags = NLM_F_REQUEST; | ||
839 | req.n.nlmsg_type = RTM_GETROUTE; | ||
840 | |||
841 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { | ||
842 | niro | 816 | return 2; |
843 | niro | 532 | } |
844 | } | ||
845 | niro | 816 | print_route(NULL, &req.n, NULL); |
846 | return 0; | ||
847 | niro | 532 | } |
848 | |||
849 | niro | 816 | /* Return value becomes exitcode. It's okay to not return at all */ |
850 | int do_iproute(char **argv) | ||
851 | niro | 532 | { |
852 | niro | 816 | static const char ip_route_commands[] ALIGN1 = |
853 | /*0-3*/ "add\0""append\0""change\0""chg\0" | ||
854 | /*4-7*/ "delete\0""get\0""list\0""show\0" | ||
855 | /*8..*/ "prepend\0""replace\0""test\0""flush\0"; | ||
856 | int command_num; | ||
857 | unsigned flags = 0; | ||
858 | niro | 532 | int cmd = RTM_NEWROUTE; |
859 | |||
860 | niro | 816 | if (!*argv) |
861 | return iproute_list_or_flush(argv, 0); | ||
862 | |||
863 | niro | 532 | /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */ |
864 | /* It probably means that it is using "first match" rule */ | ||
865 | niro | 816 | command_num = index_in_substrings(ip_route_commands, *argv); |
866 | |||
867 | niro | 532 | switch (command_num) { |
868 | case 0: /* add */ | ||
869 | flags = NLM_F_CREATE|NLM_F_EXCL; | ||
870 | break; | ||
871 | case 1: /* append */ | ||
872 | flags = NLM_F_CREATE|NLM_F_APPEND; | ||
873 | break; | ||
874 | case 2: /* change */ | ||
875 | case 3: /* chg */ | ||
876 | flags = NLM_F_REPLACE; | ||
877 | break; | ||
878 | case 4: /* delete */ | ||
879 | cmd = RTM_DELROUTE; | ||
880 | break; | ||
881 | case 5: /* get */ | ||
882 | niro | 816 | return iproute_get(argv+1); |
883 | niro | 532 | case 6: /* list */ |
884 | case 7: /* show */ | ||
885 | niro | 816 | return iproute_list_or_flush(argv+1, 0); |
886 | niro | 532 | case 8: /* prepend */ |
887 | flags = NLM_F_CREATE; | ||
888 | niro | 816 | break; |
889 | niro | 532 | case 9: /* replace */ |
890 | flags = NLM_F_CREATE|NLM_F_REPLACE; | ||
891 | niro | 816 | break; |
892 | niro | 532 | case 10: /* test */ |
893 | flags = NLM_F_EXCL; | ||
894 | niro | 816 | break; |
895 | niro | 532 | case 11: /* flush */ |
896 | niro | 816 | return iproute_list_or_flush(argv+1, 1); |
897 | niro | 532 | default: |
898 | bb_error_msg_and_die("unknown command %s", *argv); | ||
899 | } | ||
900 | |||
901 | niro | 816 | return iproute_modify(cmd, flags, argv+1); |
902 | niro | 532 | } |